1. Let f(x)=0.1x3 - 2.5x+3.4 a). Use a graphing tool to graph of f(x) for the window x[-6,6] and y[-5,10] and find f(0), f(6), and f(4). Then plot and label the three points and reproduce a sketch of the graph below. (0,3.5) (6,10) (4,0) 1098765 43-2 b. Use a ruler to sketch, above, the secant line between the points where x=0 and x= 6. The slope of this secant line is the AVERAGE rate of change of f(x) over the interval [0,6]. c. Find the average rate of change of f(x) over the interval [0,6].